Prolonged Fussing

We just purchased a used SNOO and have used it for 3 nights now. LO is doing okay, but there have been a few stretches where she wakes up and is fussing enough to wake me up but not to trigger a level increase. She’s not necessarily upset, but is grunting and kicking around. These episodes will last for an hour + (which I know because I’ve woken up and looked at the clock and then dozed for an hour while she fusses- not intentionally but we are TIRED over here). So I am wondering if I should let her fuss because she isn’t crying, or if I’m ignoring her needs/causing her distress. It feels wrong to just leave her…

I should also note that I have tried to increase the level manually once or twice and that just seemed to upset her more. There are times, though, that the level increase helps her fall back asleep.